TM 11-5820-358-10 Operator's Manual, Radio Receiver R-390A/URR 1961-01-16
"This manual describes Radio Receiver R-390A/URR (fig. 1) and covers its operation, and operator's maintenance. It includes cleaning and inspection of the equipment and replacement of parts available to first echelon maintenance. Throughout this manual, Radio Receiver R-390A/URR is referred to as the receiver."
Digitized by the Combined Arms Research Library Digital Library, US Army Combined Arms Center. http://cgsc.cdmhost.com/cdm/